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Depreciation, Amortization and Impairment (Tables)
 12 Months Ended
Dec. 31, 2020
Disclosure of Depreciation, Amortization and Impairment [Abstract]  
Schedule of depreciation and amortization
   2018   2019   2020 
   MCh$   MCh$   MCh$ 
Depreciation and amortization               
Depreciation of property and equipment (Note No.15(b) and Note No. 16)   27,185    29,194    29,845 
Depreciation of rights over leased assets (Note No. 15(d))   —    28,472    27,647 
Amortization of intangibles assets (Note No.14(b))   10,496    12,875    15,865 
Total   37,681    70,541    73,357 
Schedule of impairment loss
   2018   2019   2020 
   MCh$   MCh$   MCh$ 
Impairment loss               
Impairment loss on property and equipment (Note No.15(b))   334    2,018    1,031 
Impairment loss on intangibles assets (Note No.14(b))   —    350    629 
Impairment of rights over leased assets (Note No. 15(d))   —    187    1 
Total   334    2,555    1,661